<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
</head>
<body bgcolor="#FFFFFF" text="#000000">
Hi All,<br>
<br>
The current state of the art with <a
href="http://www.n9vv.com/Images/Apache-Labs/PureSignal.pdf">PureSignal</a>
on HPSDR and also <a
href="http://dl2stg.de/stefan/hiqsdr/gnuradio.html">Stefan's work
with the N2ADR</a> transceiver is exciting! I read each new post
with high interest, and I guess this post will hopefully spark some
more. :-) I am really curious how well it works on different types
of amplifiers. So please pipe up if you have any experience with
any of these:<br>
<br>
1) From what I've seen, the high voltage (50 V) LDMOS seems to work
well.<br>
2) My memory says that I read somewhere that lower voltage solid
state amps don't work very well.<br>
a) Is this true, and if so is it true for both BJT and FET
amps?<br>
3) How does it work with vacuum tube amps?<br>
<br>
With the advent of SDRs showing the spectrum to everyone, and now
with predistortion, we might see hope for a big improvement in
transmitted signals, but <a
href="http://www.sm5bsz.com/dynrange/dubus313.pdf">this article</a>
shows that some popular SDR transmitters end up at the bottom of the
list.<br>
<br>
Thanks to all of you who have posted test results to the list, and
to those developing the code to enable the tests. I look forward to
more great results!<br>
<br>
73,<br>
<br>
Rob<br>
KL7NA<br>
<pre class="moz-signature" cols="72">--
Rob Frohne, PhD, PE
Professor
EF Cross School of Engineering
Walla Walla University
100 SW 4th Street
College Place, WA 99324
(509) 527-2075</pre>
</body>
</html>